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Cool Roof Coatings

 

Cool roofs are the roofs that can deliver high solar reflectance (the ability to reflect the visible, infrared and ultraviolet wavelengths of the sun, reducing heat transfer to the building) and high thermal emittance (the ability to radiate absorbed, or non-reflected solar energy). The benefits associated with cool roofs include reduced cooling energy load, reduced air pollution and greenhouse gas emission, and improved human health and comfort. Cool roofs may extend the roof service life and help mitigating the urban heat island effect. Cool roofs save a lot more money and energy as compared to black roofing products even in the winter months. Here is why:

The winter days are almost twice as short as in the summer and sun sits very low to the horizon, so most of the passive solar heat transfer occurs through the windows not the roof. In the winter, flat roofs are usually covered with snow or ice for long periods of time, so roof color makes no difference. Also, there are more cloudy days in the winter, which further reduces potential heat absorption of a black roof in the winter. It is estimated that cool roofs save American economy more than $3 billion annually. Now imagine if all roofs in US would suddenly become cool! While it is true that cool roofs are mostly associated with white roofs, they come in a variety of colors and materials and are available for both commercial and residential buildings.

Benefits of cool roofs

Most of the roofs in the world (including over 90% of the roofs in the United States) are dark-colored. In the heat of the full sun, the surface of a black roof can increase in temperature as much as 50 °C (126 °F), reaching temperatures of 70 to 90 °C (158 to 194 °F). This heat increase can cause negative effects on cooling energy use and environments. Cool roofs, on the other hand, offer both immediate and long-term benefits including:

- Improved energy efficiency of roofs, especially when there isn't adequate insulation provided in the roof envelope
- Improved thermal comfort in buildings that do not have air conditioning
- Reduced air pollution and greenhouse gas emissions.

ENERGY STAR qualified roof products reflect more of the sun's rays. This can lower roof surface temperature by up to 100F, decreasing the amount of heat transferred into a building. ENERGY STAR qualified roof products can help reduce the amount of air conditioning needed in buildings, and can reduce peak cooling demand by 10-15 percent.

To learn more about our ENERGY STAR Cool Roof Coating System click here...

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